Stock-Based Awards - Additional Information (Details) - Performance Share Units	3 Months Ended
	Mar. 31, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted associated with annual cash-bonus program for senior executives and other bonus eligible employees	234,000
Vest at 100% Ahievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest upon achievement	134,000
Number of shares expected to vest, achievement percentage	100.00%
Vest at 175% Achievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares expected to vest upon achievement	234,000
Number of shares expected to vest, achievement percentage	175.00%